Manifold



July 6, 1943. B; BEARD MANIFOLD Filed Dec. 6, 1941 Ber? Beard INVENTOR ATTORNEY Patented July 6, 1943 MANIFOLD Bert Beard, Detroit, Mich, assignor to George M.

' Holley and Earl Holley Application December 6, 1941, Serial No. 421,893

1 Claim. (Cl. 123-127) The object of this invention is to arrange so that two carburetors are used in conjunction for furnishing the fuel preferably for a 6-cylinder engine. During the cruising lean range, the fuel is supplied from one carburetor. After the throttle is half opened, a second carburetor is brought into action to provide for maximum power. From this point on, the B-cylinder manifold is divided into two manifolds by a movable partition, so that at wide open throttle each carburetor supplies three cylinders. This invention is obviously not limited to a fi-cylinder engine.

In the ordinary method of operating a 6-cylinder engine (using a separate manifold and a separate carburetor for each three cylinders) a crankshaft is arranged so that the first three cylinders in a 4-cycle engine draw in fuel over a period of something less than 240 for each cylinder. Therefore, as there are three cylinders and as there are 720 in two revolutions of the crankshaft, we have the well known situation where each cylinder draws in a charge without overlapping. The charge drawn in by one cylinder therefore does not interfere with the charge drawn in by the next cylinder. In other words, we have the ideal arrangement where each cylinder receives its fuel without any interference from the other-cylinders. This, of course, is an arrangement for supplying fuel which has been known for to years.

It is obvious that although this invention is specifically applicable to a 6-cylinder engine, it is not necessarily limited to a G-cylinder engine and can be applied to multi-cylinder engines having more than 6 cylinders, or even to an engine having only 4 cylinders.

In the drawing:

Fig. 1 shows a plan view of the manifold together with the cylinders. In order to make the drawing a good illustration, a horizontal 6-cylinder engine is illustrated, but obviously an inclined engine or a vertical engine can be substituted for the horizontal cylinders shown.

Fig. 2 shows a side view looking to the right at a carburetor which supplies the normal mixture ratio and illustrates the throttle connection therefor.

Fig. 3 is a view looking to the left at the carburetor which is used for power only.-

Fig. 4 is a plan view of the throttle controls.

In the figures, i, 2, 3, I, 5 and 6 indicate the cylinders of an engine; I and II indicate the throttles, Ill being the throttle of the carburetor I which supplies the normal cruising lean mixture, ll being the throttle for the carburetor 9 which provides the power mixture. 8 indicates the throttle located in the inlet manifold connected by means of the linkage l2 and I3 with the lever 20 of the throttle shaft ll connected to the throttle ll. I5 is the throttle operating arm of the throttle rod l4 and is controlled by the rod it. The rod It carries a shoulder I! which engages with a projection I8 mounted on the throttle lever l5, so that when the rod It,

Fig. 3, moves to the left, which it does when the throttle I0 is half open, the shoulder l1 engages with the rotating projection l8 and the lever It moves anti-clockwise and the throttle II is opened. A spring I9 is provided in order to keep the throttle ll closed until it is needed. When the throttle II is opened, the lever 20 in Fig. 1 descends pushing with it the links l2 and i3 and closing the throttle 8, thereby completely separating the inlet manifold into two parts 2| and 22.

Eventually the two throttles l0 and II are wide open and of course, the engine then functions as two separate 3-cyllnder engines with entirely independent carburetors. When the main throttle I0 closes, the rod It moves to the right, Fig. 3, and the shoulder l'l simply leaves the projection l8 and the throttle 8 returns to the wide open position and the throttle l l returns to the closed position where it remains during the normal running of the car, that is, when the throttle I0 is less than half open.

In Fig. 2 the pin 25 moves to the right to open the throttle l0 and after the throttle lever 21 engages with the throttle stop 28 compressing the spring 26, the stop 28 determines the wide open position of the throttle II). A spring 29 is provided to close the throttle to when the pin 25 moves to the left.

In Fig. 4 a lever 23 is used to connect the two throttles together. The operating link is 24 and the pin that operates the ordinary throttle is 25.

An idle stop screw 30 determines the idle position of the throttle It. It is usual to provide the carburetor 1 with a low speed orifice and also to provide the carburetor I with an automatic choke, but these two elements are no part of the present invention, however necessary they may be to the proper running of the car, and therefore, it would unnecessarily complicate the disclosure if they were introduced into this specification.

The lever 23 is shown unduly long in order to make the disclosure clear. Hence two springs 30, 3| are provided to steady the lever 23.

Operation In the operation of the carburetor in Fig. 4, the rod 24 is drawn down, the spring 26 being extendedengages with the throttle arm 21 and opens the throttle I0, and continues to open the throttle III until the lever 21 engages with the stop 28 (Fig. 2), when the throttle I0 is substantially wide open. At this point the collar I'I engages with the ring I! so that the lever I5 is rotated and the throttle II is opened. Hence the throttle I0 is wide open before the throttle ll commences to open.

What I claim is:

In combination, in a multi-cyllnder engine 16 comprising two groups of one or more cylinders.

an inlet passage for each of said groups, a carbureting system common to all the cylinders of both groups, throttling means therefor, an interconnecting passage between the two inlet passages, a valve therein which when. closed restriots said common carburetlng system to one group oi cylinders, a carbureting system for the other group of cylinders, throttling means there- !or, means for opening said throttling means and closing the valve in the interconnecting passage after the throttling means for the common carbureting system has been opened to a substantial degree.

- BERT BEARD. 

